fs/ext2: fix blocks/inodes calculation

With the ROOTFS_TARGET conversion, EXT2_OPTS gets evaluated very early
(before TARGET_DIR is populated with files), so the calculated
blocks/inodes numbers are wrong.

Fix it by moving the calculation to a shell script wrapper around
genext2fs, so it only gets executed just before genext2fs runs.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

fs/ext2/ext2.mk

@@ -24,17 +24,8 @@ endif
 
 ROOTFS_EXT2_DEPENDENCIES = host-genext2fs
 
-ifeq ($(strip $(BR2_TARGET_ROOTFS_EXT2_BLOCKS)),0)
-GENEXT2_REALSIZE=$(shell LC_ALL=C du -s -c -k $(TARGET_DIR) | grep total | sed -e "s/total//")
-GENEXT2_ADDTOROOTSIZE=$(shell if [ $(GENEXT2_REALSIZE) -ge 20000 ]; then echo 16384; else echo 2400; fi)
-GENEXT2_SIZE=$(shell expr $(GENEXT2_REALSIZE) + $(GENEXT2_ADDTOROOTSIZE))
-GENEXT2_ADDTOINODESIZE=$(shell find $(TARGET_DIR) | wc -l)
-GENEXT2_INODES=$(shell expr $(GENEXT2_ADDTOINODESIZE) + 400)
-EXT2_OPTS += -b $(GENEXT2_SIZE) -N $(GENEXT2_INODES)
-endif
-
 define ROOTFS_EXT2_CMD
-	$(HOST_DIR)/usr/bin/genext2fs -d $(TARGET_DIR) $(EXT2_OPTS) $$@
+	PATH=$(TARGET_PATH) fs/ext2/genext2fs.sh -d $(TARGET_DIR) $(EXT2_OPTS) $$@
 endef
 
-$(eval $(call ROOTFS_TARGET,ext2))
+$(eval $(call ROOTFS_TARGET,ext2))

fs/ext2/genext2fs.sh

@@ -0,0 +1,39 @@
+#!/bin/sh
+# genext2fs wrapper calculating needed blocks/inodes values if not specified
+
+export LC_ALL=C
+
+CALC_BLOCKS=1
+CALC_INODES=1
+
+while getopts x:d:D:b:i:N:m:g:e:zfqUPhVv f
+do
+    case $f in
+	b) CALC_BLOCKS=0 ;;
+	N) CALC_INODES=0 ;;
+	d) TARGET_DIR=$OPTARG ;;
+    esac
+done
+
+# calculate needed blocks
+if [ $CALC_BLOCKS -eq 1 ];
+then
+    BLOCKS=$(du -s -c -k $TARGET_DIR | grep total | sed -e "s/total//")
+    if [ $BLOCKS -ge 20000 ];
+    then
+	BLOCKS=$(expr $BLOCKS + 16384)
+    else
+	BLOCKS=$(expr $BLOCKS + 2400)
+    fi
+    set -- $@ -b $BLOCKS
+fi
+
+# calculate needed inodes
+if [ $CALC_INODES -eq 1 ];
+then
+    INODES=$(find $TARGET_DIR | wc -l)
+    INODES=$(expr $INODES + 400)
+    set -- $@ -N $INODES
+fi
+
+exec genext2fs $@